Formula Symbols - D
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D
| Symbol | Greek Symbol | Definition | US | Metric | Value |
|---|---|---|---|---|---|
| \(Da\) | - | Damkohler number | dimensionless | dimensionless | - |
| \(\delta\), \(\;\lambda\) | delta , lambda | dampening coefficient | - | - | - |
| \(\zeta\) | zeta | damping ratio | dimensionless | dimensionless | - |
| \(f\), \(\;C_f\), \(\;f_d\) | - | Darcy friction factor | dimensionless | dimensionless | - |
| \(Da\) | - | Darcy's law | - | - | - |
| \(Da\) | - | Darcy number | dimensionless | dimensionless | - |
| \(DW\) | - | Darcy-Weisbach equation | dimensionless | dimensionless | - |
| \(D\) | - | Dean number | dimensionless | dimensionless | - |
| \(De\) | - | Deborah number | dimensionless | dimensionless | - |
| \(w_d\) | - | Debye angular frequency | - | - | - |
| \(q_d\) | - | Debye angular wave number | - | - | - |
| \(\lambda_d\) | lambda | Debye length | - | - | - |
| \(\Theta_d\) | Theta | Debye temperature | - | - | - |
| \(D\) | - | Debye-Waller factor | - | - | - |
| \(\lambda\) | lambda | decay constant | - | - | - |
| \(d\) | - | deceleration | \(ft\;/\;sec^2\) | \(m\;/\;s^2\) | - |
| \(a\) | - | deceleration rate | \(ft\;/\;sec^2\) | \(m\;/\;s^2\) | - |
| \(dB\) | - | decibel | dimensionless | dimensionless | - |
| \(DSD\) | - | decision sight distance | \(ft\) | \(m\) | - |
| \(d\), \(\; \delta\) | delta | deflection | - | - | - |
| \(\delta\) | delta | deformation | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(x\) | - | degree of ionization | - | - | - |
| \(\mu\), \(\;S\) | mu | degree of saturation | dimensionless | dimensionless | - |
| \(F\) | - | degrees of freedom | - | - | - |
| \(\rho\) | rho | density | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(\rho_a\) | rho | density of air | - | - | - |
| \(\rho\) | rho | density (aether) | constant | constant | \(9.605125782\;x\;10^{24}\;kg\;/\;m^3\) |
| \(\rho_f\) | rho | density of fluid | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(\rho_o\) | rho | density of object | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(\rho_v\) | rho | density of vapor | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(\rho\) | rho | density of an ideal gas | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(N_e\), \(\;\rho\) | rho | density of state | - | - | - |
| \(\rho_w\) | rho | density of water | - | - | - |
| \(z\) | - | depth | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(\partial\), \(\;d\) | partial | derivative (rate of change) | - | - | - |
| \(V\) | - | design speed | \(mph\) | \(kmh\) | - |
| \(R^2\) | - | determination coefficient | dimensionless | dimensionless | - |
| \(T_d\) | - | dewpoint temperature | \(^\circ F\) | \(C\) | |
| \(d\) | - | diameter | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(\epsilon\) | epsilon | dielectric constant | - | \(F\;/\;m\) | - |
| \(P\) | - | dielectric polarization | - | - | - |
| \(d\), \(\;\Delta\) | delta | differential | - | - | - |
| \(D\), \(\;D_n\), \(\;D_p\) | - | diffusion coefficient | \(lbf\) | \(N\) | - |
| \(L_n\), \(\;L_p\) | - | diffusion length | - | - | - |
| \(\alpha\) | alpha | diffusivity | \(ft^2\;/\;hr\) | \(m^2\;/\;s\) | - |
| \(a\), \(\;b\) | - | dimension | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(DA\) | - | dimensional analysis | - | - | - |
| \(k_d\) | - | dimensional constant | - | - | - |
| \(n\) | - | dimensionless exponent | - | - | - |
| \(K\) | - | dimensionless factor | - | - | - |
| \(N\), \(DN\) | - | dimensionless number | - | - | - |
| \(\mu\), \(\;C_d\) | mu | discharge coefficient | dimensionless | dimensionless | - |
| \(d\), \(\;\vec{d}\), \(\;s\), \(\;\delta\) | delta | displacement | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \( \vec{D}\) | - | displacement current | - | - | - |
| \(\psi\), \(\;\delta\) | psi, delta | dissipation factor | - | - | - |
| \(E_d\) | - | dissociation energy | - | - | - |
| \(d\), \(\;l\), \(\;x\), \(\;y\) | - | distance | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(s\) | - | distance along cable | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(U\) | - | distance between anchore | \(in\) | \(mm\) | - |
| \(a\) | - | distance to lowest cable point | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(d_3\) | - | distance traversed by opposing vehicle | \(ft\) | \(m\) | |
| \(d_2\) | - | distance while passing vehicle occupies left lane | \(ft\) | \(m\) | |
| \(w\) | - | distributed load | \(lbf \;/\; ft\) | \(N \;/\; m\) | - |
| \(E_d\) | - | donor ionization energy | - | - | - |
| \(K_2\) | - | downstream resistance coefficient | dimensionless | dimensionless | - |
| \(D\) | - | draft | \(in-wg\) | kPa | - |
| \(C_d\) | - | drag coefficient | dimensionless | dimensionless | - |
| \(F_d\) | - | drag force | \(lbf\) | \(N\) | - |
| \(v_{dr}\) | - | drift velocity | - | - | - |
| \(\zeta\) | zeta | dryness fraction | - | - | - |
| \(\rho_{db}\) | rho | dry bulk denssity of soil | \(lb/gal\) | \(g/mL\) | - |
| \(Du\) | - | Dukhin number | dimensionless | dimensionless | - |
| \(Q\), \(\;q\) | - | dynamic pressure | \(ft-lbf\;/\;ft^2-sec\) | \(Pa\) | - |
| \(\mu\) | mu | dynamic shear viscosity | \(lbf-sec \;/\; ft^2\) | \(mPa-s\) | - |
| \(a\) | - | dynamic speed constant | \(ft \;/\; min\) | - | - |
| \(\mu\), \(\;\eta\) | mu (used in mechanical), eta (used in chemical) | dynamic viscosity | \(ft-lbf\;/\;ft^2-sec\) | \(mPa-s\) | - |
| \(\mu_w\) | mu | dynamic viscosity of water | \(ft-lbf\;/\;ft^2-sec\) | \(mPa-s\) | - |
| Symbol | Greek Symbol | Definition | US | Metric | Value |
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